Event information

Event handler parameters

Standards information

There are no standards that apply here.

Remarks

In Asynchronous JavaScript and XML (AJAX) applications, client requests
that do not trigger traditional page navigation
should update the
IHTMLAnchorElement::hash
property. This lets the Back button
function more predictably.
The URL fragment (bookmark) can be set by script.
The value is appended to the displayed URL,
and the navigation is saved in the browser history.

Windows Internet Explorer 8. The browser's Back and Forward buttons do not generate HTMLWindowEvents3::onhashchange events for frames or iframes; instead, the frame is refreshed each time. Web pages hosted in frames or iframes should use their HTMLFrameSiteEvents::onload handler or equivalent to read the current URL hash information from the location.IHTMLAnchorElement::hash property and set their states accordingly.

When first navigating to a page that contains a hash identifier in the URL, an HTMLWindowEvents3::onhashchange event is not fired. It is expected that the freshly loaded page can inspect the value of the location.IHTMLAnchorElement::hash property to extract the current hash value. After this first page loads, setting the IHTMLAnchorElement::hash property will fire the HTMLWindowEvents3::onhashchange event as expected. This behavior avoids any negative impact on Web page load performance by removing a possible redundant event.